.img_structures {
    background-color: #305693;
    height: 135px;
    width: 180px;
    padding:5px;
    margin-left:5px;
    margin-bottom:5px;
    display:block;
    float:left;
    font-family: Arial, Verdana, Helvetica, sans-serif;
    font-size: 12px;
    font-style: normal;
    line-height: normal;
    font-weight: bold;
    font-variant: normal;
    text-transform: none;
    color: #ffffff;
    text-decoration: none;
    text-align: justify;
}

.img_structures:hover {
    background-color: #305693;
    height: 135px;
    width: 180px;
    padding:5px;
    margin-left:5px;
    margin-bottom:5px;
    display:block;
    float:left;
    filter : alpha(opacity=20); 
    -moz-opacity : 0.2; 
    opacity : 0.2;
}

.structures_titre {
    font-family: Verdana, Arial, Helvetica, sans-serif;
    font-size: 12px;
    font-style: normal;
    line-height: normal;
    font-weight: bold;
    font-variant: normal;
    text-transform: none;
    color: #ff0000;
    text-decoration: none;
}

.structures_texte {
    font-family: Verdana, Arial, Helvetica, sans-serif;
    font-size: 12px;
    font-style: normal;
    line-height: normal;
    font-weight: normal;
    font-variant: normal;
    text-transform: none;
    color: #000000;
    text-decoration: none;
}